#include <stdio.h>
#include <string.h>
#include <time.h>
#include <stdlib.h>
#include <windows.h>
#include <conio.h>

#define SNAKE_HEAD 'H'
#define SNAKE_BODY 'X'
#define BLANK_CELL ' '
#define WALL_CELL '*'
#define food $

void snake_move();
void output();
int gameover();
void creat_food();
void move(char choice, int snake_location_y[], int snake_location_x[], char map[][12]);
void gotoxy(int x, int y);


char map[12][12] = {
"***********",
"*XXXXH    *",
"*         *",
"*         *",
"*         *",
"*         *",
"*         *",
"*         *",
"*         *",
"*         *",
"***********",
};


int snake_length = 5;
int snake_location_x[144] = { 5, 4, 3, 2, 1 };
int snake_location_y[144] = { 1, 1, 1, 1, 1 };
int food_x;
int food_y;


int main() {
    creat_food();
    char choice;
    output();
    int f = 0;
    while (1) {
        choice = getch();
        snake_move();
        move(choice, snake_location_y, snake_location_x, map);
        if (!gameover()) {
            printf("gameove\n");
            return 0;
        }
        else {
            system("cls");
            output();
        }
        while (!kbhit()){
            Sleep(20);
            f ++;
            if(f == 10){
                f = 0;
                snake_move();
                move(choice, snake_location_y, snake_location_x, map);
            }

            // snake_move();
            // move(choice, snake_location_y, snake_location_x, map);

            if (!gameover()) {
                printf("gameove\n");
                return 0;
            }
            else {
                system("cls");
                output();
            }
        }
    }
    return 0;
}


void snake_move() {
    int i;
    map[snake_location_y[snake_length - 1]][snake_location_x[snake_length - 1]] = ' ';
    for (i = snake_length - 1; i > 0; i--) {
        snake_location_x[i] = snake_location_x[i - 1];
        snake_location_y[i] = snake_location_y[i - 1];
        map[snake_location_y[i]][snake_location_x[i]] = 'X';
    }
}


int gameover() {
    if (snake_location_x[0] == 10 || snake_location_x[0] == 0) {
        return 0;
    }
    if (snake_location_y[0] == 10 || snake_location_y[0] == 0) {
        return 0;
    }
    int i;
    for (i = 1; i < snake_length; i++) {
        if (snake_location_x[0] == snake_location_x[i] && snake_location_y[0] == snake_location_y[i]) {
            return 0;
        }
    }
    return 1;
}

void output() {
    int i, j;
    for (i = 0; i <= 11; i++) {
        for (j = 0; j <= 11; j++) {
            printf("%c", map[i][j]);
        }
        printf("\n");
    }
}

void creat_food() {
    srand((unsigned)(time(NULL)));
    food_x = rand() % 9 + 1;
    food_y = rand() % 9 + 1;
    while (map[food_y][food_x] != ' ') {
        food_x = rand() % 9 + 1;
        food_y = rand() % 9 + 1;
    }
    map[food_y][food_x] = '$';
}

void move(char choice, int snake_location_y[], int snake_location_x[], char map[][12]){
    if (choice == 'w') {
        snake_location_y[0] -= 1;
        map[snake_location_y[0]][snake_location_x[0]] = 'H';
    }
    if (choice == 's') {
        snake_location_y[0] += 1;
        map[snake_location_y[0]][snake_location_x[0]] = 'H';
    }
    if (choice == 'a') {
        snake_location_x[0] -= 1;
        map[snake_location_y[0]][snake_location_x[0]] = 'H';
    }
    if (choice == 'd') {
        snake_location_x[0] += 1;
        map[snake_location_y[0]][snake_location_x[0]] = 'H';
    }
    if (snake_location_x[0] == food_x && snake_location_y[0] == food_y) {
        creat_food();
        snake_length++;
        snake_location_x[snake_length - 1] = snake_location_x[snake_length - 2];
        snake_location_y[snake_length - 1] = snake_location_y[snake_length - 2];
        map[snake_location_y[snake_length - 1]][snake_location_x[snake_length - 1]] = 'X';
    }
}

void gotoxy(int x, int y){
    COORD coord;
    coord.X = x;
    coord.Y = y;
    SetConsoleCursorPosition(GetStdHandle(STD_OUTPUT_HANDLE), coord);
}